[Hammarlund] SP-600 AVC issue

[Les Locklear]

I no longer own any of the (over 20) SP-600's I had over the years or a manual. But there are some mica caps in the avc chain that do go bad. Replace those before you go any further.

Les

----- Original Message -----
From: Adam Vaughn via Hammarlund <hammarlund at mailman.qth.net>
Reply-To: Adam Vaughn <adamant316 at verizon.net>
To: <hammarlund at mailman.qth.net>
Sent: 9/24/2021 2:06:06 AM
Subject: [Hammarlund] SP-600 AVC issue
________________________________________________________________________________


Hello everyone. I picked up a SP-600 J-25C a couple of years back, and only recently had it re-capped. By and large it works fine, but I've noticed an issue with the AVC circuitry. From time to time, the incoming signal will overload the set, and the needle on the S-meter will repeatedly attempt to pin itself to the right, sometimes accompanied by the signal going silent and/or 'fluttering' along with the needle's movement. Turning down the RF gain control doesn't help; in fact, some vestiges of the overloaded signal can often still be heard from the speaker even with the control set at 0. Toggling AVC/MVC with the RF Gain set to 10 doesn't help, nor does changing bands or re-tuning. I have to toggle the AVC/MVC switch after turning down the RF gain in order to bring things back to normal, at least for a time. I've tried changing out V14 in favor of a NOS JAN 6AL5, but to no avail. Any ideas where I should look? Thanks in advance!-Adam

Adam Vaughn
Collector of old computers, video game systems, radios and other electronic equipment...Visit my page athttp://www.electronixandmore.com/adam/index.html
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